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Questions and Answers

What aspect of riprap's design is essential to resist displacement by water energy?

  • The weight, size, and shape of the stones (correct)
  • The temperature of the surrounding environment
  • The color of the stones used
  • The depth of the water above the riprap

What is a key benefit of using gabion systems in areas where construction equipment can't easily access?

  • They are cheaper than other types of erosion control.
  • They use heavier rocks than traditional riprap.
  • They enable the use of smaller rocks for the same resistance as larger rocks. (correct)
  • They allow for flexible channel linings that can change shape.

What determines the thickness of wire mattresses used for channel linings according to FHA guidance?

  • The historical rainfall data of the area
  • The overall length of the channel being lined
  • Only the type of wire used
  • The erodibility of the bank soil, maximum velocity of the water, and bank slope (correct)

Which materials can be used to fabricate gabion baskets or mattresses?

<p>Commercially available wire units or wire fencing material (B)</p> Signup and view all the answers

Which of the following statements about the stiffness of gabion systems is false?

<p>Gabion systems cannot be used for vertical channel linings. (B)</p> Signup and view all the answers

What does the AASHTO Soil Classification System primarily classify?

<p>Inorganic soils for subgrade suitability (B)</p> Signup and view all the answers

What particle size class does gravel fall into according to AASHTO?

<p>75 mm to No.10 sieve (D)</p> Signup and view all the answers

How is the Plasticity Index (PI) calculated?

<p>LL – PL (A)</p> Signup and view all the answers

What is the moisture content at which a soil changes from liquid to plastic state called?

<p>Liquid Limit (A)</p> Signup and view all the answers

Which type of fill materials is classified as GW, GM, or GP under the USCS?

<p>Gravels with over 50% retained on No. 200 sieve (B)</p> Signup and view all the answers

What does the term Atterberg Limits refer to in soil testing?

<p>Tests determining moisture content for clay and silt (D)</p> Signup and view all the answers

Which of the following particle sizes is classified as Fine Sand according to AASHTO?

<p>No.40 to No.200 sieve (D)</p> Signup and view all the answers

Which organization is responsible for establishing the AASHTO Soil Classification System?

<p>American Association of State Highway and Transportation Officials (D)</p> Signup and view all the answers

What is the maximum liquid limit (LL) for Granular Fill as per the ATTERBERG LIMITS?

<p>25% (D)</p> Signup and view all the answers

Which material is NOT typically used as Borrow Fill?

<p>Highly clayey soil (D)</p> Signup and view all the answers

According to the specifications, what is the maximum percentage of the fraction passing the No. 40 sieve in Borrow Fill?

<p>35% (D)</p> Signup and view all the answers

What is the minimum percentage by weight passing the No. 200 sieve for Base Course Materials?

<p>5% (C)</p> Signup and view all the answers

What kind of materials are classified as Base Course Materials?

<p>Durable fragments of stone and sand (B)</p> Signup and view all the answers

What is the range for the diameter of riprap gradations?

<p>2 to 42 inches (D)</p> Signup and view all the answers

What ASTM test determines the Plasticity Index (PI) for Granular Fill?

<p>ASTM 424 (B)</p> Signup and view all the answers

Which term describes a layer of stone placed to prevent erosion or scour?

<p>Riprap (A)</p> Signup and view all the answers

Flashcards

AASHTO Soil Classification

A system that classifies inorganic soils based on drainage and bearing capacity.

Atterberg Limits

Tests on soils passing a #40 sieve to determine moisture content ranges.

Liquid Limit (LL)

The water content at which soil changes from liquid to plastic.

Plastic Limit (PL)

Water content at which soil just starts to crumble when rolled.

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Plasticity Index (PI)

Range of water content where soil acts like plastic (Liquid Limit-Plastic Limit).

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Fill Materials (USCS)

Soils, stones, or sand for raising grades, used under foundations.

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GW, GM, GP classification

Gravel-based fill materials, where more than half is retained by a #200 sieve and #40 sieve

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SW, SM classification

Sand-based fill materials, where more than half is retained by a #200 sieve and more than half passes #40 sieve.

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Riprap Resistance

Riprap's ability to withstand water movement depends on its weight, size, shape, the channel/bank's structure, and the filter blanket.

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Gabion System

Wire-enclosed riprap made of mats or baskets filled with small rocks, anchored to slopes; used for water erosion control.

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Gabion Advantages

Gabions use smaller rocks for the same resistance as larger riprap, and are advantageous for inaccessible areas and steeper slopes.

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Gabion Wire Thickness

The wire mattress thickness for channel linings depends on soil erosion, water velocity, and bank slope.

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Gabion Construction Materials

Gabion baskets can be made from commercial units, wire fencing, or No. 9 or No. 12 galvanized wire.

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Granular Fill

Soil materials with at least 50% sand equivalent, used to prevent fine particle movement during seepage.

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Borrow Fill

Selected, approved pit-run gravel, granite, sand, shale, cinders, or similar materials with less than 35% passing a #200 sieve, used for fills and subgrades.

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Base Course

Hard, durable stone fragments with a sand filler, free from vegetation, conforming to specific grading requirements (AASHTO).

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Riprap

A layer of large stones used to prevent erosion or scour of structures and embankments.

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Sand Equivalent

Measure of the amount of fine material in a soil, expressed as a percentage.

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ASTM C 33

A standard test method for granular fill materials.

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Liquid Limit (LL)

The water content at which a soil changes from a plastic state to a liquid state.

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Plasticity Index (PI)

A measure of the plasticity of soil, calculated as the difference between the Liquid Limit and Plastic Limit.

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Study Notes

BUILDING TECHNOLOGY

  • Siteworks is a category of building technology.
  • Acronyms related to earthworks: AASHTO, ANSI, ASTM, DPWH, USCS.
  • AASHTO Soil Classification System classifies inorganic soils for subgrade materials, based on drainage and bearing capacity.
  • AASHTO defines particle sizes: boulders (> 75mm), gravel (75mm to No.10 sieve), coarse sand (No.10 to No.40 sieve), fine sand (No.40 to No.200 sieve), silt-clay particles (< No.200 sieve).
  • Atterberg Limits are tests performed on soils passing the No.40 sieve.
  • Liquid Limit (LL) is the water content at which a soil changes from liquid to plastic state.
  • Plastic Limit (PL) is the water content at which a soil begins to crumble when rolled into a thread.
  • Plasticity Index (PI) is the difference between the Liquid Limit and Plastic Limit (LL - PL).
  • Fill materials include soil, crushed stone, and sand. Classified using USCS.
  • GW, GM, GP - Gravels with > 50% retained on No. 200 sieve and > 50% on No. 40 sieve.
  • SW, SM - Sands with > 50% retained on No. 200 sieve and 50% or more passing No.40 sieve.
  • Granular Fill or Filters are soil materials with a sand equivalent of at least 50% and prevent the movement of fine particles.
  • Borrow Fill - selected laboratory-approved pit-run gravel, disintegrated granite, sand, shale, cinders or other similar materials with no more than 35% fraction passing the No. 200 sieve.
  • Base Course Materials - hard, durable fragments of stone and a filler of sand or other finely divided mineral matter, free from vegetable matter and lumps of clay, complying with AASHO T-11 and T-26.
  • Local Borrow Fill materials: BANDA Y BANDA, ESCOMBRO P5,000 per 15 – 16 cum, ESCOMBRO – BULIK (for Rip-rap)
  • Riprap is a layer of stone placed to prevent erosion.
  • Gabion System - wire-enclosed riprap mats or baskets filled with small riprap and anchored.
  • Geosynthetics - construction materials consisting of synthetic components for use with or within earth materials.
  • Categories of geosynthetics: geotextiles, geomembranes, geocomposites, geonets, and geocells.
  • Geotextiles are a woven or nonwoven fabric made from: polyester or polypropylene; used for separation, filtration, and in-plane drainage.
  • Geomembranes are continuous polymeric sheets that are impermeable.
  • Geocomposites consist of a combination of geosynthetic components, usually sheet or edge drains.
  • Geonets consist of a continuous extrusion of polymeric ribs that form void space through which in-plane flow capacity can be achieved.
  • Geocells are three-dimensional prefabricated polymeric systems used for stabilizing soft subgrades and protection of steep slopes.
  • Slope-Erosion Protection Materials - temporary and permanent. Open mesh polymeric systems (e.g., coir jute) and combinations of polymeric and biodegradable mesh.
  • Termite and Bukbok Proofing: Physical barriers, Chemical barriers, Colony Elimination (Bait) System.
  • Termite Resistant Sand
  • Termite Mesh
  • Home Construction
  • Pre-construction chemical barriers.
  • Vertical chemical barriers
  • Horizontal chemical barriers
  • Colony Elimination (Bait) System
  • Choker Aggregate
  • Hot Mix Asphalt or Asphaltic Concrete
  • Cold Mix Asphalt or Asphaltic Concrete
  • Asphaltic Macadam
  • Asphalt Overlay
  • Cementing Materials
  • Lime - one of the oldest manufactured building materials made from calcination of limestone (carbonates of calcium and magnesium); used as a mortar and plaster.
  • Quicklime, slaked lime (hydrated lime)
  • Gypsum - used as a plaster.
  • Portland cement - a finely pulverized clinker made from a mix of argillaceous and calcareous materials, includes iron oxide(III) and other ingredients.
  • Storage of Cement
  • Concrete - a mix of cement, aggregate and water which hardens into a stone-like material.
  • Qualities of good concrete
  • Materials of concrete - cement, aggregates, water
  • Slump test
  • Proportioning of concrete - use good quality materials; determine water-cement ratio; determine consistency using slump test; adding correct aggregate amounts to achieve desired consistency
  • Mixing of concrete
  • Machine mixing
  • Hand Mixing
  • Transporting and placing of concrete
  • Shrinkage of concrete & temperature changes
  • Curing of concrete
  • Treatments of lumber
  • Preservation of lumber
  • Deterioration of lumber
  • Deforestation of lumber
  • Types and sizes of lumber

WOOD AND PLASTICS

  • Properties of Wood as building material
  • Classification of Wood
  • Softwoods
  • Hardwoods
  • Structure of Wood - Sapwood and Heartwood
  • Properties of Wood including Hardness, Flexibility, and Durability
  • Defects of Wood (Decay, Checks, Shakes, Knots, Pitchpockets, Wane, and Warping)
  • Methods of sawing: Plainsawing, Quartersawing
  • Classification of Lumber
  • Measurement of Lumber: Board Feet
  • Seasoning of Lumber - Air drying and Kiln drying
  • Deterioration of Lumber - Decay and Insects
  • Preservation of Lumber - Oil-type and Water-borne preservatives

WOOD COMPOSITES

  • Plywood - most common wood composite, made by gluing multiple layers of thin veneer together with the grain of each layer at right angles to the adjacent ones;
  • Hardboard
  • Chipboard
  • Fiberboards
  • Medium Density Fiberboards
  • MDF - a type of hardboard - made of wood fibers glued under heat and pressure, dense, non-porous, and resistant to moisture
  • Gypsum Boards
  • Fiber cement boards
  • Particle board

MILLWORK

  • Millwork encompasses finished lumber cuts and processed at a lumber mill
  • Types of wood molding

PLASTICS USED IN ARCHITECTURE

  • Classification of plastics
  • Thermoplastics
  • Thermosetting plastics
  • Acrylic - a transparent material, used in windows, skylights, cladding, lighting fixtures.
  • Cellulosics
  • Polyethylene (PE)
  • Polystyrene
  • Polyvinyl Chloride (PVC)
  • Polycarbonates
  • Polypropylene
  • Nylons
  • Fluoroplastics
  • ABS - acrylonitrile butadiene styrene - a versatile and high-strength substance

DOORS AND WINDOWS

  • Glass
  • Types of flat glass (Sheet, Plate, Float)
  • Other types of glass (Annealed, Heat-strengthened, Tempered, Laminated)
  • Wired Glass, Patterned Glass, Obscure glass, Insulating glass
  • Tinted Glass
  • Reflective glass
  • Low-emissivity (low-e) glass

HARDWARE

  • Nails
  • Screws
  • Bolts
  • Characteristics of nails
  • Types of nails
  • Driving and fastening techniques
  • Handling nail fasteners
  • Screw sizes, types and materials
  • Bolt types and sizes
  • Washers and their uses
  • Expansion bolts
  • Toggle bolts
  • Rivets
  • Explosive rivets
  • Adhesives - types, applications, characteristics, etc

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